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CN101742635B - Mobile terminal location method based on relay station under TDD (time division duplex) mode - Google Patents

Mobile terminal location method based on relay station under TDD (time division duplex) mode Download PDF

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Publication number
CN101742635B
CN101742635B CN200810170465.6A CN200810170465A CN101742635B CN 101742635 B CN101742635 B CN 101742635B CN 200810170465 A CN200810170465 A CN 200810170465A CN 101742635 B CN101742635 B CN 101742635B
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China
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mobile terminal
relay station
base station
station
relay
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CN200810170465.6A
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CN101742635A (en
Inventor
周雷
郑旭峰
赵铮
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Mobile Radio Communication Systems (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

The invention discloses a method based on a location mobile station of a relay station, which comprises the following steps of: sending a location request to a based station by a mobile terminal; informing the mobile terminal to send the resource of a ranging signal by the base station; informing one or more relay stations to receive the ranging signal sent by the mobile terminal by the base station; calculating an arrival angle alpha 1 from the mobile terminal to the base station by the base station and calculating an arrival angle alpha 2 from the mobile terminal to the relay station by the relay station; sending a signal transmission time t1 between the mobile terminal and the base station and a signal transmission time t2 between the mobile terminal and the relay station to the base station by the mobile terminal; sending the arrival angle alpha 2 from the mobile terminal to the relay station to the base station by the relay station; and obtaining the location of the mobile terminal by the base station according to the arrival angle alpha 1, the arrival angle alpha 2, the signal transmission time t1 and the signal transmission time t2. The method can improve the precision of a single base station, reduces the adoption of multi-base station locating and timing and the expense brought by communications between base stations, and avoids measurement errors caused by quite small power received by adjacent base stations.

Description

Based on the mobile terminal locating method of relay station under tdd mode
Technical field
The present invention relates to wireless mobile telecommunication technology field, particularly under tdd mode based on the mobile terminal locating method of relay station.
Background technology
The research of wireless location technology starts from the automatic vehicle location system of the sixties in 20th century, this technology extensive use in the scopes such as public transport, taxi dispatching and public security tracking subsequently.Afterwards, along with people are to the Requirement Increases of location-based information service, wireless location technology obtains the concern of more researchers, the appearance of global positioning system (GPS) more makes wireless location technology create qualitative leap, positioning precision is greatly enhanced, within can reaching 10m.Although directly utilize GPS can reach a kind of ideal locating effect, he needs special receiving equipment, is not very convenient concerning most of user.In recent years, universal along with cellular mobile system, the aspects such as location technology starts to determine for cellular system design, switching, service area, traffic monitoring.At present, wireless location can be divided into satellite radio to locate and terrestrial wireless location, and the satellite systems such as satellite fix utilizes GPS, the double satellite receiver of GLONASS and China realize the three-dimensional localization of moving target; Terrestrial wireless location then realizes the two-dimensional localization of moving target by the parameter such as propagation time, signal strength, phase place, incident angle measuring radio wave.Cellular radio location belongs to terrestrial wireless navigation system.Wireless location system in existing cellular mobile communications networks is divided into the wireless location based on mobile communications network, the wireless location based on travelling carriage, mixed positioning etc. by mobile communication structure.In recent years, along with the quick increase of mobile subscriber, the demand of location-based service is also increased greatly, in the cellular system, location Based service has many types, and as public safety, location-based note takes service, follow-up service strengthens the Routing Service etc. called out.In current cellular radio location system, in order to avoid increasing overhead to mobile terminal, many employings be network targeting scheme, received by multiple base station simultaneously and detect the signal that sends of travelling carriage, the parameter according to measuring positions estimation by network to travelling carriage.Mobile terminal is regular handset often, this just needs to install monitoring equipment to base station, measure the signal parameter that travelling carriage sends, the approximate location of travelling carriage is estimated again by suitable algorithm, and mobile telecommunication channel characteristic is depended in the propagation of signal to a great extent, positioning precision is greatly affected.
The most frequently used wireless location method in existing cellular mobile communications networks is TDOA (TimeDifference of Arrival).Traditional TDOA localization method schematic diagram as shown in Figure 1.TDOA is a kind of localization method based on reverse link, the time difference arriving two base stations by detecting mobile station signal determines the position of travelling carriage, travelling carriage must be positioned at on the Hyperbolic Equation that is focus of two base stations, determine that the two-dimensional position coordinate of travelling carriage needs to set up two or more Hyperbolic Equation, that is need the base station of more than at least three to receive mobile station signal, and two hyp intersection points are the two-dimensional position coordinate of travelling carriage.TDOA method is not sought knowledge the concrete time that signal is propagated, and can also eliminate or reduce due to the common error that channel produces on all receivers, under normal conditions, positioning precision be higher than TOA method.But because power control causes from the transmission power of mobile station close to serving BS little, the power that adjacent base station is received is very little, cause larger measure error, namely the power that receives of adjacent base station is very little, cause larger measure error, i.e. the too little measure error brought of the SNR of adjacent base station.
Summary of the invention
The object of this invention is to provide a kind of localization method of relay station assistant base station.
For achieving the above object, a kind of method based on relay station positioning mobile station, comprises step:
Mobile terminal sends Location Request to base station;
Base station notice mobile terminal sends the resource of distance measuring signal;
Base station notifies the distance measuring signal that one or more relay station mobile terminal receive sends;
Base station calculates the angle of arrival α of mobile terminal to base station 1the angle of arrival α of mobile terminal to relay station is calculated with relay station 2;
Mobile terminal is by the signal transmission time t between mobile terminal and base station 1and the signal transmission time t between mobile terminal and relay station 2send to base station;
Relay station is by the angle of arrival α of mobile terminal to relay station 2send to base station;
Base station is according to angle of arrival α 1, α 2with signal transmission time t 1, t 2obtain the position of mobile terminal.
Method of the present invention can improve single architecture precision, decreases when adopting many architectures, the measure error that the expense brought of communicating between base station is avoided the power that receives due to adjacent base station very little simultaneously and caused.
Accompanying drawing explanation
Fig. 1 is traditional TDOA localization method schematic diagram;
Fig. 2 is the locate mode that base station worked in coordination with by single relay station;
Fig. 3 is RTD algorithm schematic diagram;
Fig. 4 is the signal flow graph that the locate mode of base station worked in coordination with by single relay station;
Fig. 5 is the locate mode schematic diagram that base station worked in coordination with by many relay stations;
Fig. 6 is the signal flow graph that the locate mode of base station worked in coordination with by many relay stations;
Fig. 7 is locate mode collaborative between two relay stations;
Fig. 8 is the signal flow graph of locate mode collaborative between two relay stations;
Fig. 9 is locate mode schematic diagram collaborative between many relay stations;
Figure 10 is the signal flow graph that the locate mode of base station worked in coordination with by many relay stations;
Figure 11 is 16m relay station, base station and communication of mobile terminal principle.
Embodiment
The present invention provides the localization method of 2 kinds of relay station (Relay) assistant base stations:
First method is the localization method of the collaborative base station of relay station (Relay).Work in coordination with at relay station in the localization method of base station and can be divided into two kinds of modes:
1st kind of mode is the locate mode that base station worked in coordination with by single relay station.Single relay station works in coordination with the locate mode of base station as shown in Figure 2.In fig. 2, mobile terminal (Mobile Station, MS) can communicate with relay station (Relay) with base station (Base Station) simultaneously.First mobile terminal sends Location Request to base station, after base station receives request, to the distance measuring signal of mobile terminal (ranging) Resources allocation, then notify that the uplink distance measurement signals (uplinkranging) of mobile terminal monitored by relay station (Relay).After base station and relay station receive ranging signal, send confirmation signal (ACK) respectively to mobile terminal, algorithm calculates base station respectively and relay station transmits a signal to the time of reaching according to RTD (Round Trip Delay) for mobile terminal.RTD algorithm schematic diagram as shown in Figure 3.According to Fig. 3; Utilize formula
D BS ↔ MS = c · ( T MS - T BS ) / 2 c = 3 × 10 8 m / s - - - ( 1 )
D RS ↔ MS = c · ( T MS ′ - T RS ) / 2 - - - ( 2 )
The distance of mobile terminal and base station and relay station can be calculated.With the distance of mobile terminal and base station with the distance of mobile terminal and relay station for two circles of radius have two intersection points.Follow the signal according to mobile terminal to arrive again position that the angle of base station and relay station and the angle of arrival (Angle ofArrival, AoA) finally determine mobile terminal.Concrete measurement such as the coordinate dividing into travelling carriage is (x 0, y 0) and the coordinate of base station be (x 1, y 1) coordinate of relay station is (x 2, y 2), then there is following relation:
( x 0 - x 1 ) 2 + ( y 0 - y 1 ) 2 = R 10 ( x o - x 2 ) 2 + ( y 0 - y 2 ) 2 = R 20
Wherein, R 10and R 20can by measuring the time t arriving base station and relay station from travelling carriage 10and t 20determine.Obviously R is had 10=c × t 10and R 20=c × t 20, wherein, c is the skyborne propagation velocity of electromagnetic wave.According to equation group above, we can obtain two solutions, then arrive angle and the angle of arrival (Angle of Arrival, the AoA) θ of base station and relay station according to the signal of mobile terminal, can remove a solution; Finally obtain the position coordinates of mobile terminal.
Single relay station works in coordination with the signal flow graph of the locate mode of base station as shown in Figure 4.Idiographic flow is as follows:
1. uplink distance measuring (ranging) signal that the information of base station assigns uplink distance measuring (ranging) signal and mobile terminal (MS) send monitored by serving Base Station requests relay station needs to feed back the angle of arrival (AoA) that mobile terminal transmits simultaneously; And signal transmission time t between serving Base Station requests mobile terminal MS feedback base station and mobile terminal 1and signal transmission time t between relay station and mobile terminal 2;
2. the request of relay station answer service base station, agrees to monitor above-mentioned information and signal and the angle of arrival of the mobile terminal signal of measurement is fed back to serving BS; The simultaneously request of MS also granted service base station, by signal transmission time t between the serving BS measured and mobile terminal 1and signal transmission time t between relay station and mobile terminal 2feed back to serving BS;
3. serving BS distributes the opportunity (opportunity) of uplink distance measurement signals transmitting to MS;
4. serving BS sends RNG-RSP signal to MS, this signal comprises following parameter, and (state status=continue is continuous, launch uplink detection signal and the time interval (Rendezvous time) receiving RNG-RSP signal, the sequence number (orthogonal code) of orthogonal code, the side-play amount (TX opportunity offset) of uplink detection signal launching time; This signal monitored by relay station simultaneously;
5. serving BS distributes the bandwidth of mobile terminal uplink detection signal;
6. mobile terminal sends uplink detection signal
7. the angle of arrival (AoA) α that mobile terminal transmits measured respectively by serving BS and relay station 1and α 2
8. serving BS and relay station send uplink detection signal response message (RNG-ACK)
9. relay station feeds back to the angle of arrival (AoA) α of base station movement terminal transmission signal 2
10. mobile terminal utilizes RTD (round trip delay) algorithm to calculate signal transmission time t between base station and mobile terminal 1and signal transmission time t between relay station and mobile terminal 2
11. mobile terminals are by t 1and t 2feed back to serving BS
12. serving BSs are according to t 1, t 2with angle of arrival α 1, α 2determine the position of mobile terminal
2nd kind of mode is the locate mode that base station worked in coordination with by many relay stations.Many relay stations work in coordination with the locate mode schematic diagram of base station as shown in Figure 5.In Figure 5, mobile terminal (Mobile Station, MS) can communicate with multiple relay station (Relay) with base station (Base Station) simultaneously.First mobile terminal sends Location Request to base station, after base station receives request, to the distance measuring signal of mobile terminal (ranging) Resources allocation, then notify that the uplink distance measurement signals (uplink ranging) of mobile terminal monitored by multiple relay station (Relays).After multiple relay station receives uplink distance measurement signals, tell to base station by the signal transmission time of measurement, base station utilizes TDOA algorithm can calculate the position of mobile terminal.Specific algorithm is as follows:
As base station BS 1 and relay station RS 2and the range difference R between travelling carriage 21=R 2-R 1time, travelling carriage must be positioned at base station BS and relay station RS 1for focus, with base station BS and relay station RS 1range difference perseverance be R 21solid line hyperbola on.When knowing base station BS and relay station RS simultaneously 3and the range difference R between travelling carriage 31=R 3-R 1time, can obtain other one group with base station BS and relay station RS 3for focus, be R with the range difference perseverance of these two focuses 31dotted line hyperbola to upper.So, two groups of hyp intersection point representative estimations to travelling carriage.
If the coordinate of travelling carriage is (x 0, y 0) and the coordinate of base station be (x 1, y 1) coordinate of relay station is (x 2, y 2) (x 3, y 3), then there is following relation:
( ( x o - x 2 ) 2 + ( y 0 - y 2 ) 2 - ( x o - x 1 ) 2 + ( y 0 - y 1 ) 2 ) 2 = R 21 2 ( ( x o - x 3 ) 2 + ( y 0 - y 3 ) 2 - ( x o - x 1 ) 2 + ( y 0 - y 1 ) 2 ) 2 = R 31 2 - - - ( 3 )
Wherein, R 21and R 31can by measuring the time difference t arriving base station and relay station from travelling carriage 21and t 31determine.Obviously R is had 21=c × t 21and R 31=c × t 31, wherein, c is the skyborne propagation velocity of electromagnetic wave.The position coordinates of travelling carriage just can be obtained according to equation group above.
Many relay stations work in coordination with the signal flow graph of the locate mode of base station as shown in Figure 6.Concrete signal flow is as follows:
Uplink distance measuring (ranging) signal that the information of 1 serving Base Station requests relay station monitoring base station assigns uplink distance measuring (ranging) signal and mobile terminal (MS) send needs signal transmission time t between feedback relay station and mobile terminal simultaneously 2;
The request of 2 relay station answer service base stations, agrees to monitor above-mentioned information and signal and by signal transmission time t between the relay station measured and mobile terminal 2feed back to serving BS;
3 serving BSs distribute the opportunity (opportunity) of uplink distance measurement signals transmitting to MS
4 serving BSs send RNG-RSP signal to MS, this signal comprises following parameter, and (state status=continue is continuous, launch uplink detection signal and the time interval (Rendezvous time) receiving RNG-RSP signal, the sequence number (orthogonal code) of orthogonal code, the side-play amount (TX opportunity offset) of uplink detection signal launching time; This signal monitored by relay station simultaneously;
The bandwidth of 5 base station assigns mobile terminal uplink detection signals;
6 mobile terminals send uplink detection signal
The transmission time t that mobile terminal transmits measured by 7 relay stations 2
The transmission time t that 8 base station measurement mobile terminals transmit 1
9 relay stations feed back to the transmission time t of base station measurement 2
10 base stations are according to the time t measured 1and t 2calculate time difference T
In like manner, base station can calculate with other relay stations be the time difference.
Second method is the localization method cooperated between relay station.
The locate mode cooperated between the 1st kind of mode two relay stations.Locate mode collaborative between two relay stations as shown in Figure 7.In the figure 7, mobile terminal (Mobile Station, MS) can communicate with two relay stations (Relay) simultaneously.First mobile terminal sends Location Request to major relay station (Primary Relay), after major relay station receives request, to the distance measuring signal of mobile terminal (ranging) Resources allocation, then notify that minor relay station (Secondary Relay) monitors the uplink distance measurement signals (uplink ranging) of mobile terminal.After two relay stations receive ranging signal, send confirmation signal (ACK) respectively to mobile terminal, mobile terminal calculates two relay stations respectively according to RTD (Round Trip Delay) algorithm and transmits a signal to the time of reaching.The distance of mobile terminal and two relay stations can be calculated according to the time of advent.Then distance is fed back to major relay station.Major relay station is according to mobile terminal and its distance with the distance of mobile terminal and minor relay station do two circles for radius and this two circles have two intersection points, one of them focus is exactly the position of mobile terminal.Follow the signal according to mobile terminal to arrive again position that the angle of two relay stations and the angle of arrival (Angle of Arrival, AoA) finally determine mobile terminal, major relay station. last major relay station by the location information report of MS to base station.
The signal flow graph of locate mode collaborative between two relay stations as shown in Figure 8.Idiographic flow is as follows:
1. request minor relay station in major relay station monitors uplink distance measuring (ranging) signal that the information of base station assigns uplink distance measuring (ranging) signal and mobile terminal (MS) send needs to feed back the angle of arrival (AoA) that mobile terminal transmits simultaneously; And signal transmission time t between serving Base Station requests mobile terminal MS feedback major relay station and mobile terminal 1and signal transmission time t between minor relay station and mobile terminal 2;
2. the request of minor relay station answer service base station, agrees to monitor above-mentioned information and signal and the angle of arrival of the mobile terminal signal of measurement is fed back to major relay station; The simultaneously request of MS also granted service base station, by signal transmission time t between the major relay station measured and mobile terminal 1and signal transmission time t between minor relay station and mobile terminal 2feed back to major relay station;
3. the opportunity (opportunity) of uplink distance measurement signals transmitting is distributed in major relay station to MS;
4. major relay station sends RNG-RSP signal to MS, this signal comprises following parameter, and (state status=continue is continuous, launch uplink detection signal and the time interval (Rendezvous time) receiving RNG-RSP signal, the sequence number (orthogonal code) of orthogonal code, the side-play amount (TX opportunity offset) of uplink detection signal launching time; Minor relay station monitors this signal simultaneously;
5. the bandwidth of mobile terminal uplink detection signal is distributed in major relay station;
6. mobile terminal sends uplink detection signal
7. major relay station and minor relay station measure the angle of arrival (AoA) α that mobile terminal transmits respectively 1and α 2
8. major relay station and minor relay station send uplink detection signal response message (RNG-ACK)
9. minor relay station feeds back to the angle of arrival (AoA) α of base station movement terminal transmission signal 2
10. mobile terminal utilizes RTD (round trip delay) algorithm to calculate signal transmission time t between major relay station and mobile terminal 1and signal transmission time t between minor relay station and mobile terminal 2
11. mobile terminals are by t 1and t 2feed back to major relay station
12. major relay stations are according to t 1, t 2with angle of arrival α 1, α 2determine that the position of mobile terminal is last, the positional information of mobile terminal is told serving BS by major relay station.
The locate mode cooperated between the 2nd kind of multiple relay station of mode.Locate mode schematic diagram collaborative between many relay stations as shown in Figure 9.In fig .9, mobile terminal (Mobile Station, MS) can communicate with multiple minor relay station (Relay) with major relay station (Base Station) simultaneously.First mobile terminal sends Location Request to major relay station, after major relay station receives request, to the distance measuring signal of mobile terminal (ranging) Resources allocation, then notify that multiple minor relay station (Relays) monitors the uplink distance measurement signals (uplink ranging) of mobile terminal.After multiple minor relay station receives uplink distance measurement signals, tell to major relay station by the signal transmission time of measurement, major relay station utilizes TDOA algorithm can calculate the position of mobile terminal.Finally, by the location information report of mobile terminal to serving BS.Many relay stations work in coordination with the signal flow graph of the locate mode of base station as shown in Figure 10.Concrete signal flow is as follows:
Uplink distance measuring (ranging) signal that the information of 1 major relay station request minor relay station monitoring major relay station distribution uplink distance measuring (ranging) signal and mobile terminal (MS) send needs signal transmission time t between feedback minor relay station and mobile terminal simultaneously 2;
The request of 2 minor relay station answer service base stations, agrees to monitor above-mentioned information and signal and by signal transmission time t between the minor relay station measured and mobile terminal 2feed back to major relay station;
The opportunity (opportunity) of uplink distance measurement signals transmitting is distributed to MS in 3 major relay stations
4 major relay stations send RNG-RSP signal to MS, this signal comprises following parameter, and (state status=continue is continuous, launch uplink detection signal and the time interval (Rendezvous time) receiving RNG-RSP signal, the sequence number (orthogonal code) of orthogonal code, the side-play amount (TX opportunity offset) of uplink detection signal launching time; Minor relay station monitors this signal simultaneously;
The bandwidth of mobile terminal uplink detection signal is distributed in 5 major relay stations;
6 mobile terminals send uplink detection signal
7 minor relay stations measure the transmission time t that mobile terminal transmits 2
The transmission time t that mobile terminal transmits is measured in 8 major relay stations 1
9 minor relay stations feed back to the transmission time t that major relay station is measured 2
10 major relay stations are according to the time t measured 1and t 2calculate time difference T in like manner, major relay station can calculate with other minor relay stations be the time difference, according to above-mentioned TDOA algorithm principle, the position coordinates of mobile terminal can be calculated.Finally, the positional information of mobile terminal is told to serving BS by major relay station.
Embodiment
In the requirement documents of 802.16m, define and need to support relay station, the relay station simultaneously specified in up-to-date 16m system description documents, base station and communication of mobile terminal principle are as shown in figure 11. and upper as can be seen from figure, 16m defines base station, the communication mode of relay station and mobile terminal:
1st paths represents: relay station can communicate with base station;
2nd paths represents: can communicate between relay station;
3rd paths represents: mobile terminal can and relay station communication;
4th paths represents: mobile terminal can and base station communication;
Due to the base station in 16m system, relay station and mobile terminal can carry out communicating therefore these methods in this paper be completely suitable for 16m standard.

Claims (6)

1., based on a method for relay station positioning mobile station, comprise step:
Mobile terminal sends Location Request to base station;
Base station notice mobile terminal sends the resource of distance measuring signal;
Base station notifies the distance measuring signal that one or more relay station mobile terminal receive sends;
Base station calculates the angle of arrival α of mobile terminal to base station 1the angle of arrival α of mobile terminal to relay station is calculated with relay station 2;
Mobile terminal is by the signal transmission time t between mobile terminal and base station 1and the signal transmission time t between mobile terminal and relay station 2send to base station;
Relay station is by the angle of arrival α of mobile terminal to relay station 2send to base station;
Base station is according to angle of arrival α 1, α 2with signal transmission time t 1, t 2obtain the position of mobile terminal.
2., based on a method for relay station positioning mobile station, comprise step:
Mobile terminal sends Location Request to major relay station;
Major relay station notice mobile terminal sends the resource of distance measuring signal;
Major relay station notifies the distance measuring signal that one or more minor relay station mobile terminal receive sends;
Major relay station calculates the angle of arrival α of mobile terminal to major relay station 1the angle of arrival α of mobile terminal to minor relay station is calculated with minor relay station 2;
Mobile terminal is by the signal transmission time t between mobile terminal and major relay station 1and the signal transmission time t between mobile terminal and minor relay station 2send to major relay station;
Minor relay station is by the angle of arrival α of mobile terminal to minor relay station 2send to major relay station;
Major relay station is according to angle of arrival α 1, α 2with signal transmission time t 1, t 2obtain the position of mobile terminal;
The position coordinates of mobile terminal is reported to base station by major relay station.
3., based on a method for relay station positioning mobile station, comprise step:
Mobile terminal sends Location Request to base station;
Base station notice mobile terminal sends the resource of distance measuring signal;
Base station notifies the distance measuring signal that two or plural relay station mobile terminal receive send;
Each relay station calculates the signal transmission time t between mobile terminal and relay station 1;
Base station calculates the signal transmission time t between mobile terminal and base station 2;
Each relay station is by the signal transmission time t of mobile terminal to relay station 1send to base station;
Base station is according to each signal transmission time t 1with signal transmission time t 2obtain the time difference T for each relay station;
Base station calculates the position of mobile terminal according to the time difference T for each relay station.
4. method according to claim 3, is characterized in that base station is calculated as follows the position of mobile terminal:
( ( x o - x 2 ) 2 + ( y 0 - y 2 ) 2 - ( x o - x 1 ) 2 + ( y 0 - y 1 ) 2 ) 2 = R 21 2 ( ( x o - x 3 ) 2 + ( y 0 - y 3 ) 2 - ( x o - x 1 ) 2 + ( y 0 - y 1 ) 2 ) 2 = R 31 2
Wherein, if the coordinate of travelling carriage is (x 0, y 0), the coordinate of base station is (x 1, y 1), the coordinate of a relay station is (x 2, y 2), the coordinate of another relay station is (x 3, y 3), wherein R 21represent distance from mobile terminal to base station and from mobile terminal to the difference the distance of a described relay station, R 31represent distance from mobile terminal to base station and from mobile terminal to the difference the distance of another relay station described.
5., based on a method for relay station positioning mobile station, comprise step:
Mobile terminal sends Location Request to base station;
Base station notice mobile terminal sends the resource of distance measuring signal;
Base station notifies the distance measuring signal that its major relay station and two or more minor relay station mobile terminal receives send;
Major relay station calculates the signal transmission time t between mobile terminal and major relay station 1;
Each minor relay station calculates the signal transmission time t between mobile terminal and minor relay station 2;
Each minor relay station is by the signal transmission time t of mobile terminal to minor relay station 2send to major relay station;
Major relay station is according to signal transmission time t 1with each signal transmission time t 2calculate the time difference T for each minor relay station;
Major relay station obtains the position of mobile terminal according to the time difference T for each minor relay station;
The position coordinates of mobile terminal is reported to base station by major relay station.
6. method according to claim 5, is characterized in that base station is calculated as follows the position of mobile terminal:
( ( x o - x 2 ) 2 + ( y 0 - y 2 ) 2 - ( x o - x 1 ) 2 + ( y 0 - y 1 ) 2 ) 2 = R 21 2 ( ( x o - x 3 ) 2 + ( y 0 - y 3 ) 2 - ( x o - x 1 ) 2 + ( y 0 - y 1 ) 2 ) 2 = R 31 2
Wherein, if the coordinate of travelling carriage is (x 0, y 0), the coordinate of base station is (x 1, y 1), the coordinate in major relay station is (x 2, y 2), the coordinate of minor relay station is (x 3, y 3), wherein R 21represent distance from mobile terminal to base station and from mobile terminal to the difference the distance in described major relay station, R 31represent distance from mobile terminal to base station and from mobile terminal to the difference the distance of described minor relay station.
CN200810170465.6A 2008-11-06 2008-11-06 Mobile terminal location method based on relay station under TDD (time division duplex) mode Expired - Fee Related CN101742635B (en)

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